Biofilm thickness effect on the diffusion limitation in the bioprocess reaction: Biofloc critical diameter significance |
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Authors: | M. Hamdi |
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Affiliation: | (1) Département de Technologie (Bioprocédés), Ecole Supérieure des Industries Alimentaires, 58, Av. Alain Savary, 1003 Tunis, Tunisia |
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Abstract: | A convenient physical model for biomass involves consideration of individual cells as active centers dispersed through a continuous region in which transport takes place by molecular diffusion. This paper investigates for steady state conditions the variation of apparent kinetic constant (Km ) of bacteria in relation to biofloc diameter with solid and/or liquid-phase diffusion. When the biochemical reactions are limited only by liquid-phase diffusion, theKm increases whenD increases. With solid-phase diffusion limitation only, theKm increases linearly with the diameterD of the floc. When both solid and liquid-phase diffusion limitations are considered, the apparentKm is affected by liquid-phase diffusion limitation with very smallD and by solid-phase diffusion limitation with higherD. The critical diameterDc can be assumed to be theD at which solid-phase diffusion limitation becomes more significant than liquid-phase diffusion limitation. |
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